So I just sold my SX Mini, but I had the firmware upgrade for user TCR. I have two DNA 200 boxes. VS and VT200. I've used the 0.25 and 0.50 Crown SS coils on both. TC works fine on both. Despite everything from Uwell saying the coils are 316, everyone uses 304 TCR. The difference is around 50F at 400F. Everyone, including me, say the 316 TCR is too cold. I did some burn tests on a dry coil, and the results were a little inconclusive. But using 304 TCR of 1016, it would smoke at 475F. Any hoo... I had one coil I thought was burning but wasn't sure. But then there was no doubt. On the SX mini and DNA. Oh well, bad coil. Lately, on both DNAs the TC has been inconsistent. Maybe 10% of the time sort of. TC works fine. Period. Then, another time I'll go to vapers, and it's cold. I like around 450F. But it feels like nothing. And no initial punch either. Then, a couple times now, I go to vapers, and it's super hot. Like full power. I have power at 100w. It doesn't let up. It doesn't temp control. Yesterday, when it happened, I lowered temp all the way to 200F but no change. I let it sit for a while, and it works fine again. Today, it was much hotter than normal. But turning temp down it did work, but at like 350F. I never use power mode. Never lock my ohms. Never connect a hot atty. Ohms are not fluctuating all over. But both boxes have done it. So I can only assume it's the Crown. The VT200 seems to hit noticeably less than the VS. Even though the settings are identical. And swapping tanks it's the same. Like the VT200 is set 50F lower. But, settings are identical and I use the same curve. It's just really weird. I am lost as to why it all works normal, even compared to the SX Mini, but then every now and then it doesn't. It's happened 5-6 times now. Anyone have any ideas?